separated files for PXListView and files for demo app, added ARC to podspec
Revert "separated files for PXListView and files for demo app, added ARC to podspec"

This reverts commit ea33ae2db07bcc972cd80905de9be9f7ee20a3de.
requires arc in pod spec, separated files so only those we want are put in the pod
updated hash and bumped version